2017年7月
Chirality-Switchable 2,2 '-Bipyridine Ligands Attached to Helical Poly(quinoxaline-2,3-diyl)s for Copper-Catalyzed Asymmetric Cyclopropanation of Alkenes
ACS MACRO LETTERS
- ,
- ,
- 巻
- 6
- 号
- 7
- 開始ページ
- 705
- 終了ページ
- 710
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1021/acsmacrolett.7b00352
- 出版者・発行元
- AMER CHEMICAL SOC
Helical poly(quinoxaline-2,3-diyl)s copolymers PQXbpy consisting of a coordinating unit, which bears a varied achiral, substituted 2,2'-bipyridyl pendant, and a chiral unit bearing chiral side chains were synthesized and used as a ligand in copper-catalyzed asymmetric cyclopropanation of olefins with diazoacetates, giving up to 91:9 er with high chemical yield. The enantioselection relied on the helical structure of PQXbpy. A single PQXbpy afforded either of a pair of enantiomers with high enantioselectivity by switching its helical sense by changing the reaction solvent from pure toluene to a 3/1 mixture of toluene and 1,1,2-trichloroethane.
- リンク情報
- ID情報
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- DOI : 10.1021/acsmacrolett.7b00352
- ISSN : 2161-1653
- Web of Science ID : WOS:000406087600013